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Hissing sound from left speaker - Yamaha PSR 275

by Malin
(California)

Hi.

I just bought my Yamaha PSR 275, it's a old, used one.
Yesterday it sounded just fine but today it has a hissing sound/noise from the left speaker when I press some of the keys.
What can I do?
Is it fixable?
Thanks

Comments for
Hissing sound from left speaker - Yamaha PSR 275

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Oct 17, 2009
Rating
starstarstarstarstar 		PSR 275 Speaker Problem
by: Alfred

Dear Malin: Your unit is not that old (2003) and you might try: 1)If powered by Batteries, clean the Compartment Terminals and install fresh batteries. 2)If powered by an Adaptor, clean its Plug and the Jack (aperture in keyboard).
While you are about it, buy a can of compressed air and blow out all spaces between the keys. Follow with a STRONG vacuum job in the same spaces. Please post a follow-up message in this Forum tolet me know if these actions cure your problem. Other participants will benefit from your experience. Thanks and good luck.
Nov 29, 2009
Rating
starstarstarstarstar 		Tinny sound in left speaker
by: David

I have a similar issue, but I wouldn't categorize the problem as being a hissing. In the left speaker there's a sort of "fuzzy" sound, but only at certain tones (the mid range). It isn't connected to any keys, just the tone. It almost makes me wonder if the speaker has somehow come a bit loose.

The issue appeared and then disappeared for a few days, and now it seems to be back. I'm using the keyboard with an AC adapter. I turn off the keyboard when I'm not using it, so it gets a "reboot" each day. I tried using compressed air around the keys but it had no effect.

Any thoughts, advice, or other things to try would be much appreciated. Thank you!
Nov 30, 2009
Rating
starstarstarstarstar 		Hissing Speaker PSR 275
by: Alfred

Dear David: Long distance diagnosis is difficult at best, but from what you say, it COULD be a warped (left)speaker cone which can no longer reproduce the mid range signals. You understand that under the circumstances, this is an "educated guess".
I am always loathe to suggest opening any keyboard, but IF YOU ARE AN ADEPT DIYer, you need to buy an OEM Speaker from Yamaha and solder it in place of the offending speaker.
You may receive other suggestions. I would consider all of them.
If my "guess" is right,please post a message so we all can learn from your experience. Thanks and good luck.
Dec 04, 2009
Rating
starstarstar 		Further observations
by: David

Hi and thanks for the reply, Alfed! I'm not sure how confident I'd be to remove the old speaker cone and replace it with a new one, as I'm not very well versed in sound electronics. I'm fine with opening things up and taking a peak, though, so I may do that to see if something looks obviously wrong (comparing the left to the right) or loose.

One observation... I'm living in the Northeast, and it generally becomes very, very dry during the winter. Lately we had a bit of rain and the humidity levels rose with it. My speaker woes completely disappeared, but today they returned. I know that wood tends to warp a bit depending on the humidity, but I'd never heard of plastic and/or metal doing so... but I'm wondering if it's possible that this problem is humidity-dependent, and that when there's low humidity the speaker isn't fully anchored (or something like that - not sure how the insides are assembled). Any thoughts there?

If I have the time I'll try to take a look at the insides in the coming weeks. Until then... maybe I should invest in a humidifier :)
Dec 04, 2009
Rating
starstarstarstarstar 		Speaker Defect
by: Alfred

Dear David: You may be right re humidity, and you just reminded me of a "trick" which might be the answer. I used it many-a-moon-ago when fooling around with warped/off center Cones. First, VERY GENTLY push the cone downward and observe if in the short space it travels, there is any friction against its magnet core. If there is, the Cone is off-center as it moves up-and down when the keyboard is activated, and that would be the problem you have. On the assumption that it is, you then "stuff" a small wad of cotton wool between the BACK OF THE CONE and its Metal Frame. This will be a trial & error procedure, taking care not to pierce the Cone, and locating the cotton ball so that it keeps the Cone centered as it vibrates around the magnet. Further, do not pack the cotton too tightly as you will want it to "spring" with the vibrations. As you've done, please again post a message if the "trick" works. Good luck.

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